133 lines
3.2 KiB
ArmAsm
133 lines
3.2 KiB
ArmAsm
/*
|
|
* Copyright (c) 2011 Aeroflex Gaisler
|
|
*
|
|
* BSD license:
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
|
|
#include <asm-leon/leonstack.h>
|
|
#include <asm-leon/winmacros.h>
|
|
|
|
/* Registers to not touch at all. */
|
|
#define t_psr l0
|
|
#define t_pc l1
|
|
#define t_npc l2
|
|
#define t_wim l3
|
|
#define twin_tmp1 l4
|
|
#define glob_tmp g4
|
|
#define curptr g6
|
|
|
|
/* Number of register windows */
|
|
.global _nwindows_min1, _nwindows
|
|
|
|
.text
|
|
.align 4
|
|
.globl leonbare_trapreturn, schedule_callback
|
|
|
|
leonbare_trapreturn:
|
|
|
|
/* a optional scheduler can be called here */
|
|
set schedule_callback, %g2
|
|
ld [%g2], %g2
|
|
cmp %g2,%g0
|
|
beq 3f
|
|
nop
|
|
|
|
jmpl %g2,%o7
|
|
#ifndef _SOFT_FLOAT
|
|
add %sp, FW_REGS_SZ + 8 + SF_REGS_SZ , %o1 ! pt_regs ptr
|
|
#else
|
|
add %sp, SF_REGS_SZ , %o1 ! pt_regs ptr
|
|
#endif
|
|
|
|
3:
|
|
|
|
#ifndef _SOFT_FLOAT
|
|
ld [%sp + (SF_REGS_SZ + PT_REGS_SZ + FW_REGS_SZ - 4)],%g2
|
|
sethi %hi(fpustate_current), %g3
|
|
st %g2, [%g3+%lo(fpustate_current)]
|
|
#endif
|
|
|
|
wr %t_psr, 0x0, %psr ! enable nesting again, clear ET
|
|
|
|
#ifndef _FLAT
|
|
/* Will the rett land us in the invalid window? */
|
|
mov 2, %g1
|
|
sll %g1, %t_psr, %g1
|
|
|
|
sethi %hi(_nwindows), %g2 !NWINDOWS
|
|
ld [%g2+%lo(_nwindows)], %g2
|
|
|
|
srl %g1, %g2, %g2
|
|
or %g1, %g2, %g1
|
|
rd %wim, %g2
|
|
andcc %g2, %g1, %g0
|
|
be 1f ! Nope, just return from the trap
|
|
sll %g2, 0x1, %g1
|
|
|
|
/* We have to grab a window before returning. */
|
|
sethi %hi(_nwindows_min1), %g3 !NWINDOWS-1
|
|
ld [%g3+%lo(_nwindows_min1)], %g3
|
|
|
|
srl %g2, %g3, %g2
|
|
or %g1, %g2, %g1
|
|
and %g1, 0xff, %g1
|
|
|
|
wr %g1, 0x0, %wim
|
|
|
|
/* Grrr, make sure we load from the right %sp... */
|
|
PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
|
|
|
|
restore %g0, %g0, %g0
|
|
RW_LOAD(sp)
|
|
b 2f
|
|
save %g0, %g0, %g0
|
|
|
|
/* Reload the entire frame in case this is from a
|
|
* kernel system call or whatever...
|
|
*/
|
|
1:
|
|
#endif
|
|
PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
|
|
2:
|
|
|
|
#ifdef _FLAT
|
|
restore
|
|
RW_LOAD(sp)
|
|
save
|
|
#endif
|
|
|
|
wr %t_psr, 0x0, %psr
|
|
nop; nop; nop
|
|
|
|
jmp %t_pc
|
|
rett %t_npc
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef _FLAT
|
|
#warning _FLAT not implemented
|
|
#endif
|
|
|
|
|